Question

How to check if a string contains only uppercase letters in Java

Answer 1

import java.util.stream.IntStream;

public class StringContainsOnlyLowercaseLetters_Java {
    public static void main(String[] args) {
        String s = "CPPJAVACSHARP";
        
        boolean b = IntStream.range(0, s.length()).allMatch(i -> Character.isUpperCase(s.charAt(i)));
        
        System.out.println(b);
    }
}

 
 
/*
run:
 
true
 
*/

 

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